Cow caught fly (7)
I believe the answer is:
chasten
'cow' is the definition.
(both can mean to subdue or humble)
'caught fly' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'fly' becomes 'hasten'.
'c'+'hasten'='CHASTEN'
(Other definitions for chasten that I've seen before include "Subdue - a stench (anag)" , "Castigate or punish" , "Subdue, correct by punishing" , "Have a restraining effect on (someone)" , "Moderate" .)